Time-dependent lateral diffusion in WO3 thin films
Yükleniyor...
Tarih
2023-10
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Elsevier B.V.
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
We have studied the anomalous lateral diffusion process in thin tungsten trioxide films by optical means. The diffusion process seems to start at imperfections within the film a few seconds after the H+ ion intercalation begins, and progresses parallel to the surface of the film. We measured the mean square displacement of the diffusion front and used its time-dependence to calculate the instantaneous diffusion coefficient. The anomalous exponents are found to be 2.24 and 2.92 for 400 nm and 270 nm thick films, respectively. We explain the observed large diffusion coefficients and depth dependence of the expansion of the film by interfacial job-sharing diffusion of electrons and protons. Raman measurements were also carried out on virgin films, and on films after the lateral diffusion. Although the observed spectrum after the lateral diffusion is, in general, consistent with the literature for H+ intercalated films, we observe an additional strong band at 855 cm?1. This lateral diffusion process is observed to be irreversible; therefore, it has to be avoided in electrochromic switching devices based on WO3.
Açıklama
This work was supported in part by Işık University ( BAP-13B102 ).
Anahtar Kelimeler
Electrochromism, Interfacial job-sharing diffusion, Irreversible processes, Raman spectrum, Tungsten oxide, Anomalous diffusion, Tungsten-oxide films, Raman-spectroscopy, Degradation, Coloration, Dynamics, Hydrogen, Water
Kaynak
Surfaces and Interfaces
WoS Q Değeri
Q1
Scopus Q Değeri
Q1
Cilt
41
Sayı
Künye
Karakurt, İ., Başar, G., Leiderer, P., Parlatan, Ş. & Arapoğlu, N. (2023). Time-dependent lateral diffusion in WO₃ thin films. Surfaces and Interfaces, 41, 1-9. doi:10.1016/j.surfin.2023.103286
